Primary study of recovery rate of undeveloped gas reservoir in Changxing Formation, Yuanba Gas Field

The Changxing reservoir in the Yuanba Gas Field is a deep-buried carbonate gas pool with high sulfur content,low porosity and low permeability.At present,the Changxing reservoir is undeveloped.Various methods such as empirical equation,analogy and material balance have been applied to determine the recovery rate of different calculation units.Technologically recoverable reserves have been calculated,providing an important basis for preparing development program scientifically and reasonably.